Year	Number of
1990	8900.27
1991	8921.01
1992	8869.71
1993	8794.07
1994	8693.73
1995	8678.9
1996	8617.35
1997	8514.19
1998	8404.63
1999	8189.16
2000	8086.15
2001	7938.31
2002	7816.18
2003	7690.01
2004	7483.36
2005	7567.5
2006	7709.56
2007	7867.69
2008	7983.24
2009	8128.95
2010	8163.06
2011	8298.74
2012	8457.96
2013	8607.93
2014	8811.16
2015	9007.55
2016	9216.86